<template>
  <div>
    <!-- 面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table :class="['tree-table']"
      :data="cateList"
      :columns="columns"
      :selection-type="false"
      :expand-type="false"
      show-index
      index-text="#"
      border
      :show-row-hover="false">
        <!-- 是否有效的模板-->
        <template v-slot:isok="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
        <!-- 排序的模板-->
        <template v-slot:order="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作的模板-->
        <template v-slot:opt="scope">
          <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditCateById(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeCateById(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区域-->
      <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="queryInfo.pagenum"
            :page-sizes="[3, 5, 10, 20]"
            :page-size="queryInfo.pagesize"
            layout="total, sizes, prev, pager, next, jumper"
            :total="total">
      </el-pagination>
    </el-card>

    <!-- 添加商品分类的对话框-->

    <el-dialog
      title="添加分类"
      :visible.sync="addCareDialogVisible"
      width="50%"
      @close="addCateDialogColsed">

      <el-form :model="addCateForm" status-icon :rules="CateRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>

        <el-form-item label="父级分类">
          <el-cascader
              v-model="selectedKeys"
              :options="parentCateList"
              :props="cascaderProps"
              @change="parentCateChange"
              clearable
              change-on-select>
          </el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCareDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  <!-- 编辑商品分类的对话框-->

  <el-dialog
      title="编辑分类"
      :visible.sync="editCareDialogVisible"
      width="50%">

      <el-form :model="editCateForm" status-icon :rules="CateRules" ref="editCateFormRef" label-width="100px">

        <el-form-item>
          <el-input v-model="editCateForm.cat_id" type="hidden"></el-input>
        </el-form-item>

        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>

      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="editCareDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      /* 查询条件 */
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      addCareDialogVisible: false,
      editCareDialogVisible: false,
      /* 商品分类的数据列表 */
      cateList: [],
      /* 父级分类的数据 */
      parentCateList: [],
      /* 总数据条数 */
      total: 0,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      editCateForm: {
        cat_id: '',
        cat_name: ''
      },
      /* 添加分类的规则对象 */
      CateRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      /* 级联选择器的配置对象 */
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: [],

      /* 为table指定列的定义 */
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ]
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    /* 获取商品分类列表 */
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
      this.cateList = res.data.result
      this.total = res.data.total
    },
    /* 获取父级分类的数据列表 */
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) return this.$message.error('获取父级分类数据失败！')
      this.parentCateList = res.data
    },
    /* 监听 pagesize 改变 */
    handleSizeChange (newsize) {
      this.queryInfo.pagesize = newsize
      this.getCateList()
    },
    /* 监听 pagenum 的改变 */
    handleCurrentChange (newpage) {
      this.queryInfo.pagenum = newpage
      this.getCateList()
    },
    /* 显示添加分类的对话框 */
    showAddCateDialog () {
      this.getParentCateList()
      this.addCareDialogVisible = true
    },
    /* 级联选择器选项发生改变时触发 */
    parentCateChange () {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    /* 监听对话框关闭事件 */
    addCateDialogColsed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    /* 发起添加分类的请求 */
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败！')
        this.$message.success('添加分类成功了')
        this.getCateList()
        this.addCareDialogVisible = false
      })
    },
    /* 发起删除商品分类请求 */
    async removeCateById (id) {
      const confirmResult = await this.$confirm('此操作将删除商品分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        this.$message.info('已取消删除')
      } else {
        const { data: res } = await this.$http.delete('categories/' + id)
        if (res.meta.status !== 200) return this.$message.error('删除商品分类失败！')
        this.$message.success('删除商品分类成功了')
        this.getCateList()
      }
    },
    /* 显示编辑分类的对话框 */
    async showEditCateById (id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) return this.$message.error('查询分类失败！')
      this.editCateForm = res.data
      this.editCareDialogVisible = true
    },
    /* 发起编辑分类的请求 */
    editCate () {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put('categories/' + this.editCateForm.cat_id, { cat_name: this.editCateForm.cat_name })
        if (res.meta.status !== 200) return this.$message.error('编辑分类失败！')
        this.$message.success('编辑分类成功了')
        this.editCareDialogVisible = false
        this.getCateList()
      })
    }

  }
}
</script>

<style lang="less" scoped>
.tree-table {
  margin: 15px 0;
  font-size: 16px;
}
.el-cascader {
  width: 100%;
}
</style>
